Aunilateral or bilateral reduction of visual acuity where there is a dullness of vision:

Amblyopia

Amblyopia is a sight disorder in which there is reduction of visual acuity due to the inability of the eye and the brain to work well together. Amblyopia occurs mostly to babies and young children. Early detection and treatment of amblyopia will prevent one from having reduced vision or severe visual disability. The most common cause of amblyopia is refractive error in one or both eyes which can result in refractive amblyopia and also eye misalignment.

the correct answer is - ability to find a mate

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .